The correct answer is: C. 1964
Bokaro Steel Plant is an integrated steel plant located in Bokaro district, Jharkhand, India. It is one of the largest steel plants in India and is a public sector undertaking under the Ministry of Steel. The plant was established in 1964 and has a capacity of 10 million tonnes of steel per annum.
Option A: 1951 is incorrect because the first steel plant in India, the Tata Iron and Steel Company (TISCO), was established in 1907.
Option B: 1955 is incorrect because the Durgapur Steel Plant was established in 1956.
Option D: 1973 is incorrect because the Bhilai Steel Plant was established in 1959.